Special Hazard Suppression Flashcards

Which NFPA standard governs clean agent fire extinguishing systems such as FM-200 and Novec 1230?

Answer: NFPA 2001

NFPA 2001 covers clean agent fire extinguishing systems, including halocarbon and inert gas agents used in total flooding applications.

FM-200 (HFC-227ea) extinguishes fires primarily through which mechanism?

Answer: Heat absorption and chemical flame inhibition

FM-200 acts by absorbing heat from the flame and providing some chemical inhibition of the combustion chain reaction, unlike purely inert gas agents.

For CO2 total flooding systems, high-pressure storage cylinders maintain the agent at approximately:

Answer: 850 psi at room temperature

High-pressure CO2 systems store agent as a liquid at approximately 850 psi at ambient room temperature, while low-pressure systems store it at −20°F and 300 psi.

Inergen (IG-541) is composed of which combination of gases?

Answer: Nitrogen, argon, and carbon dioxide

Inergen (IG-541) is a blend of 52% nitrogen, 40% argon, and 8% carbon dioxide; the CO2 component stimulates breathing to help occupants evacuate.

Per NFPA 2001, the minimum hold time required after a clean agent total flooding system discharges is:

Answer: 10 minutes

NFPA 2001 requires a minimum 10-minute agent hold time following discharge to ensure fire knockdown and prevent reflash before manual intervention.

Which of the following is NOT an acceptable clean agent alternative to Halon 1301 for total flooding applications?

Answer: Halon 1211

Halon 1211 is itself an ozone-depleting halon used in streaming applications, not an environmentally acceptable alternative; the others are approved clean agent replacements.

A room protected by a CO2 total flooding system must be designed to withstand:

Answer: Pressure changes caused by rapid CO2 discharge

Rapid CO2 discharge creates significant pressure transients, so the enclosure must have adequate structural strength or pressure relief venting to prevent building damage.